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  • Friday, February 1, 2019 12:00 AM
    In the December 2018 Technically Speaking® column, some examples of different internal transmission parts that break and the problems they can cause were discussed. This month’s article comes to you as a warning of what you can break if you are not careful. Some may have already dealt with this unpleasant experience that I guarantee was accompanied with quite a few superlatives.
  • Suburu 4AT Phase ll Version ll Control and Valve Body Changes
    Friday, February 1, 2019 12:00 AM
    Sometime at the beginning of the 2004 model year, Subaru redesigned the 4AT Phase ll Control system that placed the transfer clutch control solenoid into the valve body. The new design valve body (referred to as Version II) contained 3 clutch control solenoids, 2 brake control solenoids, a TCC and pressure control solenoid (Figure 1).
  • Hydraulics Fundamentals: Accumulators & Shift Feel
    Friday, February 1, 2019 12:00 AM
    “Thuds,” “clunks,” “bangs,” “slipping” and “harsh” are all common words used by customers to describe unpleasant shift feel. These complaints can be on upshifts, downshifts, specific gear ranges or on all shifts. Accumulators and their circuits have been used for years as the primary method for controlling shift feel. These components are designed to modify a shift by essentially acting as a shock absorber for the fluid pressure that is applying a clutch, brake or band. Cushioning of this high pressure allows the apply component to engage gradually, instead of slamming on and rattling parts and bones alike.
  • PT Cruiser Trouble Code Fixed with New Part
    Friday, February 1, 2019 12:00 AM
    A customer brought her 2006 Chrysler PT Cruiser to our shop with a complaint of random high engine revs. She stated that restarting the engine resets the vehicle and it works again temporarily, and this had been going on for about four months. The vehicle had a 2.4-liter turbocharged engine with a 604 transmission.
  • Ford & GM 10R80/10L90 Speed Sensor Functions
    Thursday, January 3, 2019 11:59 AM
    There are four internally mounted two-wire Hall-Effect speed sensors found in this shared Ford and GM 10-speed venture (Figure 1). Although all four-speed sensors work the same way, one of them is slightly different than the other three. A 9-volt supply from the TCM is sent to all four sensors and a signal from each sensor returns directly back to the TCM.
  • Hydraulics Fundamentals: Main pressure regulator valve lineups
    Wednesday, January 2, 2019 4:14 PM
    As today’s transmissions continue to increase in complexity, from growing involvement in electronic controls to a seemingly exponential increase of available gear ratios, one concept remains the backbone of automatic transmissions: hydraulics. Forces, pressures and flow rates are critical considerations in all stages of a transmission’s lifecycle. Engineers use these as tools to achieve desired shift timing, shift quality and overall efficiency.
  • Don’t Assume; Be Systematic with Diagnosis
    Wednesday, January 2, 2019 4:06 PM
    Like many of you, this time of year I am usually asked to assemble a variety of items and gifts for my family members. In light of these requests, I have spent a significant amount of time analyzing why we waste so much time assembling, disassembling and re-assembling items out of an unwillingness to simply read the instructions. Often this process results in leftover spare parts and frustration.
  • Mazda’s SkyActiv-Drive 6-speed automatic unit: Magnet is Loaded with Metal
    Wednesday, January 2, 2019 3:54 PM
    The progressive development of Mazda’s “SkyActiv®” engine and transmission has resulted in an engine that should be available in 2019 called the “SkyActiv-X.” The name SkyActiv given to this drivetrain reflects their back-casting developing method.
  • Leeward Tech: Ins and Outs of Torque Converters
    Saturday, December 1, 2018 12:00 AM
    Inside the converter
    Plotting the pathways of the oil that enters and exits the converter is not an easy task if you are only looking at the parts of the converter. Adding a stator support and an input shaft to the converter parts makes this task somewhat easier.
  • Tech to Tech: Intermittent No Start Camry Woes
    Saturday, December 1, 2018 12:00 AM
    I just couldn’t resist. It was just the detective in me.
    “Yes, I will take a look at it,” I said to a new customer when she said her car would stall but only occasionally.
Beyond the missions of providing education and reference materials, Transmission Digest serves as a prime resource used as shops find the parts, supplies and services necessary for successful and profitable operation. Nine of the 12 issues published each year are focused on the products, services and suppliers relating to a specific profit center within the retail shop.

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